Charles a



(No Model.)

0. A. 'HEYBR. SGALB BEARING.

No; 555,768. Patented Mar. 5-, 1895 Fig. 2..

INVENTOH WITNESSES. I @6544 26 7 '5 agww' A TTOH/VE) UNITED STATESPATENT OFFICE.

CHARLES A. HEYER, -OF ST. JOI-INSBURY, VERMONT, ASSIGNOR TO THE E. dt T.FAIRBANKS & COMPANY, OF SAME PLACE.

SCALE-BEARING.

SPECIFICATION forming part of Letters Patent No. 555,768, dated March 3,1896.

Application filed January 16, 1895. Serial No. 585,111. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES A. l-IEYER, a citizen of the United States,residing at St. Johnsbury, in the county of Caledonia, State of Vermont,have invented certain new and useful Improvements in Scale-Bearings, ofwhich the following is a description, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

My invention relates to an improvement in weighing-scales; and theobject is to provide a device for limiting the movement of thelever-pivot in the direction of its length or transversely'of the beamor lever at the outside of the bearing. It is desirable that thislimiting movement should be accomplished with a minimum amount offriction that there may be no danger of impairing the accuracy of thescale.

To this end the invention consists in the matters hereinafter described,and referred to in the appended claims.

The invention is illustrated in the accompanying drawings, in which-Figure l is a perspective view showing the bearing complete. Fig. 2 is across-section of the same. Fig. 3 is a view similar to Fig. 1, butshowing the cap removed; and Fig. 4c is a view of the bearing and pivotwithout the end bearing for said pivot.

In the drawings, a represents the lever or beam of the scale, and b theknife-edge pivot secured at or near one end thereof. This pivot Z) ispreferably beveled, as shown in Fig. 2, for the purpose hereinafterreferred to. The post which supports the parts is shown at h, and isforked at its u er end in the usual manner. Between the forks issupported the block 0, of the shape shown, and in the apex of thegroove, on the upper surface of which rests the knife-edge of the pivotb. This block 0 may be of any suitable material, such as an agate,steel, &c., but I have found it advantageous to use ablock of glass forthis purpose on account of its frictionless qualities, and I thereforeintend to make a claim for the same.

Removably secured to the post It and extending upwardly and having aninwardlyturned flange is a cap 61, so that when this cap is in positionit with the forks practically incloses the end of the bearing-pivots b.This cap d is provided with an opening e, and on the interior surfaceadjacent to this opening is recessed to receive a glass plate g, whichcovers the opening and serves as an antifriction-bearing to limit themovement and receive the end-thrust of the pivot 17, which, by reason ofthe bevel above referred to, bears against it at only one point. Thisplate g is preferably of transparent glass, whereby the opening 6 withits glass backing affords practically a Window through which may beviewed the pivot and its support. It will be understood, however, thatany other kind of glass, a jewel, or other vitreous material may besubstituted for the transparent glass, particularly where it is notdesired to view the pivot and its support from the exterior. Again, theentire cap-piece might be constructed of glass, or both the block 0 andplate 9 of one piece of glass, or the cap, plate, and block of one pieceof glass. The cap cl is secured to the post in any suitable manner.

It will be seen that in the preferred form of my invention there isprovided a frictionless limiting bearing-plate for the lever-pivot, awindow through which the same may be observed, and a cap for holding theparts in position. Various modifications and changes may be made,however, without departing from the spirit of my invention by which asimple, cheap, and easily-replaced bearingis provided.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. In a scale-bearing the combination with the lever-pivot of asupporting-post therefor, a cap-piece arranged to cover the end of saidlever-pivot and having an opening, said cap piece provided with aninterior recess adjacent said opening, and a transparent plate of glasssecured in said recess, arranged to receive the end-thrust of the pivot,whereby an antifriction-bearing for the end of the pivot is provided,and whereby also the movement of the pivot on its supporting-surface maybe observed, substantially as described.

2. In combination with the lever-pivot, the bifurcated supporting-post,the cap-piece secured to said supporting-post, and having an Intestimony whereof I aflix my signature in presence of two witnesses.

CHARLES A. MEYER.

\Vitnesses:

PERLEY F. HAZEN, ALBERT L; FARWE 1 1L.

